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Hello, my name is***** will assist you.
On the bottom of the cavatition plate on your lower unit, is there s large round plate?
If the answer to that question is yes, the last bolt is located under that plate. Use a 1/2" socket from the top of it in the small hole to loosen the bolt that holds the plate on, then you will expose the bolt. After you remove the bolt, and have the other 4 backed off, the case should drop down slightly. If it will not budge, or it has been some time since it has been removed, you may need to tap on the rear of it with a mallet to get it to loosen up.
I have to run to a DR. appt and will be back online in just over an hour. I will look for a reply from you then.
Sounds good. Talk to you then.